Add news bullet

Author: hadley

NEWS.md

@@ -1,5 +1,6 @@
 # testthat (development version)
 
+* The failure messages for all `expect_` functions have been rewritten to first state what was expected and then what was actually received (#2142).
 * `test_file(desc = ...)` no longer loses snapshot results (#2066).
 * In `R CMD check`, snapshots now only advise on how to resolve failures once (#2207).
 * `snapshot_review()` includes a reject button and only displays the file navigation and the skip button if there are multiple files to review (#2025).